-LRB- CNN -RRB- -- Facebook says it was recently hacked , though it says no data about its more than a billion users was compromised .

The company described the `` sophisticated attack '' in a blog post on Friday , saying it took place in January when a small number of employees visited a compromised website that installed malware on their machines .

`` As soon as we discovered the presence of the malware , we remediated all infected machines , informed law enforcement and began a significant investigation that continues to this day , '' Facebook Security said in the post .

Facebook , the largest social network in the world , is the latest high-profile site to be hacked this year . Twitter announced a similar intrusion earlier this month , and major news organizations including The New York Times , Wall Street Journal and Washington Post have also admitted to being hacked .

The news sites attributed the breaches to hackers working for the Chinese government , but neither Facebook nor Twitter mention China when describing their attacks .

`` Facebook was not alone in this attack . It is clear that others were attacked and infiltrated recently as well , '' said the blog post . `` As one of the first companies to discover this malware , we immediately took steps to start sharing details about the infiltration with the other companies and entities that were affected . ''

Unlike Twitter , Facebook said it has found no evidence that any user information was compromised . Twitter said that user names , encrypted passwords and e-mail addresses for as many as 250,000 users were potentially grabbed by the hackers . It reset passwords for all affected accounts .

The string of hacks have primarily exploited vulnerabilities in the programming language Java , which is installed on most computers by default . Facebook said the site responsible for its attack took advantage of a previously unknown Java vulnerability , which Oracle patched on February 1 .

In January , the Department of Homeland Security issued an alert about the security-challenged software and recommended people turn it off on their computers . Apple turned off Java by default for its OS X users as a precaution . Full instructions on how to disable Java on any computer can be found on Oracle 's website . If you must use Java , make sure that you have downloaded the latest updates , which include key security patches .

Facebook said it will continue to work with law enforcement and others in the industry to prevent future attacks .

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Facebook says it was hacked in January when employees visited a compromised website

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The social network has found no evidence that any user data was obtained by the hackers

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This is latest in a string of high-profile hacks this year